This is a false statement only because of lack of knowledge.For NA applications both are fine, they both serve the same purpose. If you are going to supercharge it down the line somewhere and still wants cats, go with the Kooks headers with green cats as they are the only ones tested to handle the power. There are threads on here of boosted cars with kooks and ARH with their regular hi-flow cats where the catalyst brick has clogged or gotten dislodged and stuck in the x pipe area. If supercharged with no cats, either are fine. For both though, I would take into account what axle back you are using also (if stock, this doesnt matter)
This. If I could do it again, I'd go with ARH.I'm not alone in this but I'll never purchase another Kooks product. Their warranty means nothing. The original x-pipe for the SS was flawed. Their remedy was to offer a redesigned x-pipe at a discount. Replacement should have been zero cost.
This thread references the "off-road" x-pipe but the poor design affected all three of their x-pipes; non-catted, catted, and green catted.
Kooks x-pipe fitment issues